I'm definitely hoping for this. Starting at full size as it does now, the toolbar has a tendency to obscure certain other dynamic features of the site like lightbox overlays. It also hides part of the footer. I also don't get enough interaction to justify having the bar auto-expand for everyone. If only two people use it, why should the other 600 or so be encumbered? Those who want to use it can expand it.

Yes, there is the possibility that interaction will go down even more for me if the bar is defaulted to collapse, but it's always been so low that I'm already considering dropping it to reduce page, code, and script clutter. Can't get worse...